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A gas is enclosed in a cylindrical pisto...

A gas is enclosed in a cylindrical piston. When the gas is heated from `0^(@)C` to `100^(@)C`, thee piston is allowed to move to maintain a constant pressure. According to the Kinetic molecular theroy of Matter

A

the mass of the gas will increase

B

the number of molecules of gas must increase

C

the size of the individual molecules has increased

D

the average speed of the molecules has increased

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